Alfred wyatt



Oct. 20 1925,

suono A. wYA1 IAGNETIC SOUND WAVE INTENSFYING DEVICE Fld April lO. 1922 Patented Oct. l20, 1925.

UNITED STATES ALFRED WYATT, F KANSAS. CITE" EESSOURI. ASSINOR Tfr COCHRAN AND ONE-THIRD TO FRANK A. COCHRAN.

MISSOURI.

ELEC'IROM A GNEQI GNEJIHIRD TO SAMUEL J. BOTH 0F KANSAS CITY,

Application filed April 10, i922. Scrcl No. 5.50.4592,

Be it. known that l, Ali-raro H1-rrr, a citi,A of the United States, and resident of' sis City, county ot' Vlacksom State o' .i'lissouri5 have invented a certain new and useful Improvement. in. Electromargnctiil Sound-Wave-lntonsifying Devices. ol' which the following a complete specilication.

The present inventionA relates to sound amplifying devices. and aims to provide au improved construction' of this type whereby the sound waves generated by any of the common forms of sound reprotuicing or transmitting devices may be greatly intensilied in the'eourse olE their transmission to the point of vlinal reproduction by means ot the ordinary forms ot amplifying or loud speakinginstruments. u

Accordingly, the invention comprises a vif bratory diaphragm electrically actuated by means o't' an electromagnet in circuit with a. sound wave producing or transmittii'ig instrument, together with means formeclianically transmitting the Vibratory action or' said diaphragm to an electric circuit including the ampl-iving 0r loud speaking instrument which tina` ly reproduces the original sound waves or tones, through the medium oi' a suitable microphone element formingy` a. part of the latter circuit.

1With the foregoing general object in vien', the invention. will now be described by ret'-A eience to the accompanying drawingl illus-` trating one form ot' construction which .l have devised :tor embodying the proposed improvements, after which those features deemed to be novel will. be particularly set .forth and claimed.

In the drawing- Figure l. is a face View showing one end of an amplifying device constructed in aceordance with the present invention;

Figure 2 is a plan view ofthe same;

Figure 3 is a view similar to that. shown in Figure l, but with the face plate removed for disclosing the interior of the device; and

Figures 4 and 5 are sectional views, taken on the lines IVMIV and Vwv, respectively, of Figure 3, Figure 5 being on an enlarged scale.

Referring non to said drawing in detail, this illustrates the improved construction comprising a pair of housingl sections 6, 'i'5 for enclosing the operativeparts of the devicej the sect-ion G being of smaller diameter than the housing section T, and attached tl creto by means ot' seroit threads :as clearliV shown in Figuresi and Si. with 'die base por.- tion of the section (3 acting as a partition c and thereby dividingl the space within the i the diaphragm "lo held in position. to'ac': i

as the arnmture for an eiectromagi'iet of the double horse shoe type, and comprising, va pair of coils 1T connected with terminals' 1S adapted to be included in a circuit with the sound producing cr transmitting,r instrument (not snown), such as 'the reproducer of a talking machine, or the receiving instrument of a wireles system.' The coils 17 ot' the electro-magnet are `carried upon ole pieces 19 formed as parts of the langle .Ears 2), the outer ends oi which are connected by screws 2l to semi-circular ring' sections 22 and the latter supported by insulated screws 23 threaded into the partition member 8 be tween. the compartments S) and 10, a set ot three oi these screws 25E being provided as shown in, liigure To the diaphragm member l5 is centrally connected rod or stem 24 extending inwardly between the .coils 17 and tlirwough an opening in the partition 8 ttor connection with. one of the carbon elements of a microphone structure l,provideil in the compartment l() (see Figure 5). This microphone is of ordinary it'orm, and comprises a sheil orhousing 'member :it having` a stem 27 adjustably clamped by means oit a screw .28 Within a tmshing;- 2l) carried in the outer tace of the housing` section 7 and insulated therefrom by a collar 30 and washer 3]. embraced by a clamping nut 32 on vthe inner lend ot the bushing` Elf). lVithin the open portion of the sheil 6 is threaded a flanged ring 33 provided with a mica diaphragm ele-- ment S, the middle portion of which is clamped between one ot the carbon discs' 35 and a metallic disc 3G to which the stem is centrally counected,' the microphone structure beim)r so carried as to aline its ixis and vsaid'stem 2.4` ccntrall `with the di-A sphragm member 15. l l is spaced by an insulati Lothar, carbon disc 38, an

carbon 39 isl interposed between the carbon.discs 35 and 3S. The carbo'n 35 is lelectrically connected by means ot' *conductor 40, with n suitable binding post f y while 'the other carbon disc 38 is I' similarly connected by. inea-ns of a conductor, 42 with a second binding' post 43, to which posts maybe attached the conductors 44 of an electric circuit designed to include any suitable form of'arplifying or A y loud spcakingiinstrument (not shown) at the pomtwhere the sound waves or toiles are to be finali' reproduced after having been intensified y the device of the present im rovemfent. A

t is believed lthat the operation of thcvin- Btl'nment will be clear from the foregoing, the influence of the original sound waves as A trlillsxnitted through the electric circuit including ,the coils 1f acting to produce ti-uctu- /.5 ations in the A magnetic action. of these coils, and thereby causing the diaphragm member 15 to4 respond to the varyinv action of thecoils and hence reproduce t e vi- 'brations astransmitted from their source; da the vibrationsI of the diaphragm member 15 are transmitted 'directly to the microphone structure, and by its action vastly intensi- The (iaphragm 34 ring from the tied, and these intensified vibrations diiectly transmitted through the circuit connections tf 44 to the a.Y litier or other .instrument designed for tie tinal re ro uctjon of the e :sound wavcs'or tones. lf e advantage of the improved construction lies in the fact of the micgfllOn-znstl'llihent being directly conl gm structure to which "Y ff' l areelectromagnet- 10i-2,5m the source, so that 4the vibratory action fthe microphone and thc usual gramo.

and having an operative connection extendthe intensifying action of the latter main- 46 tained at a maximum. This direct association of the microphone and the electromagnetic transmitting device is of such a character as to be ieadily.embodied in a simple and compact instrument, which may be used to great advantage in the amplification of sound vibrations -as produced either bv the ordinary type of phonographs or wire css` receiving sets, and the intensitied vibrations transmitted 'to any desired 55 commercial form of amplifying or loud speaking instruments. I l

While 1 have illustrated and described what l now regard as the preferred form of const rut-tion toi: embodying the invention l desire to reserve the right to make ali such cliangesor modifications as ma fairly .fall within the scope of the appende claim.

What 1 claim is: u A sound amplifying device compris' a pair of housing sections having a partition forming separate housing compartments, an

electromagnetsupported by seid partition withinl one of said compartments and having terminals adapted for connectionl with an 7 electric circuit including sound ploducing means, a vibratory diaphragm carried by' the housing section enc osingsaid electromagnet in position for forming the arma.- ture for said eleetromagnet, a microphone supplorted by theother housing section within t e other ot' said compartments and in central axial alinement with saiddiaphragm ing centr: y through said partition tolthe center ol' said diaphragm, said microphone having terminals adapted for connection with an electric circuit including a loud speaking or amplifying instrument.

In witness whereof l hereunto aix my Il signature.

ALFRED 'YA'IT. 

